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I have noticed too that Compiz mostly doesn't decrease performance. However, KWin does and the difference can be huge. It would be cool if you made an article that compares:
- Gnome without Compiz
- Gnome with Compiz
- KDE without KWin
- KDE with KWin

I bet the numbers will be very interesting.

With full screen apps you shouldn't see any difference in performance if Kwin is configured with:

I have noticed too that Compiz mostly doesn't decrease performance. However, KWin does and the difference can be huge. It would be cool if you made an article that compares:
- Gnome without Compiz
- Gnome with Compiz
- KDE without KWin
- KDE with KWin

I bet the numbers will be very interesting.

To see if KWin is to be blamed for this, you could remove one variable:
- KDE without KWin
- KDE with KWin
- KDE with Compiz

While we are talking about performance impacts from composited environment, I have a question for all of you: do you have problem with watching a VDPAU accelerated video while composition is turned on?

I have such a problem on my GTX 470. While having kwin composition enabled, if I open a movie in SMplayer (or mplayer) configured to use VDPAU, X freezes after a while, or after skipping video (jumping to the middle of movie or similar), or sometimes immediately after starting video playback. This happens always while watching 720p or higher resolution videos, and sometimes even with smaller videos. Although X is freezed, key events are processed so I am able to pause playback (this unfreezes the X).

Compiz sucks for gaming

For me Compiz sucks when gaming both on Nvidia and Ati. Killing Compiz manually when entering game is such party breaker so I made scrips to do this automatically when entering game, and revert this when exiting game. Here are the scripts, hope someone finds them useful: